The present paper aims at presenting the ethics of eco-sustainable coexistence, as promoted by the brasilian agricultural engineer Jose Lutzenberger (1926-2002) throughout his environmentalist militancy. The authors and works that influenced Lutzenberger in his discussion on ethics and the environment are here analyzed. It is argued that Lutzenberger appropriated these readings to create a new ecological ethics, to construct a new ecological ethics in counterpoint the dominant anthropocentric ethics. From the study of Lutzenberger's works and biography, this paper presents the 10 fundamental principles of his ethics which, even if based on already existing biocentric environmental ethics, constitutes an original formulation to guide humanity in its relationship with nature.